Has anyone ever played or run Silver Age Sentinels (d20 edition)? I have a copy but have never played or run. It was a very interesting read, and the game seems more like "D&D Superheroes" than something like Mutants & Masterminds, especially the 3rd Edition.

I'm really curious about any attempts to mash-up SAS and D20 Modern or D&D 3.x. I love me some cross-genre RP.